1877.] 



MR, G. F. ANGAS ON SHELLS FROM MADAGASCAR. 527 



10. Notes on a small CoUection of Land and Freshwater 

 Shells from South-east Madagascar, with descriptions 

 of new Species. By George French Angas. C M Z S 

 F.L.S., &c. * ' ' ' 



[Eeceived June 2, 1877.] 



(Plate LIV.) 



Mr. Edward Bartlett has placed in my hands for examination a 



small collection of land and fluviatiie shells collected by Mr Waters 



at Ekongo, on the south-east coast of Madagascar. It contains the 



lollowmg species : — 



Jchatina acuta, Fer. Cydostomus bicarinafus. Sow., 

 Helix cornu.giganteum, Lam. and several varieties. 



farafanga, H. Ad. boimni, Pfr 



souverbei,Yn^. tricarinatus. Lam. 



sepulchrahs, Fer., and vars. multifasciatus, Grate. 



omphaloides, Ptr. Melania amarula. Lam. 



calypso, Pfr. Melania, sp.? 



xystera, Valenc, and vars. Navicella lineata, Lam 



devah, Petit. exitnia. 



Megalostoma crocea Lymncea natalensis, Krauss, large 

 tyclotus macarece. Petit. var. 



Nerita caffra. Wood. 

 BuLiMus BALSTONi, n. sp. (Plate LIV. fig. 7.) 

 Shell imperforate, elongately ovate, somewhat thin, shinin- 

 irregularly longitudinally striated, and crossed here and there wifh 

 concentric lines, giving portions of the surface somewhat of a tessel- 

 lated appearance, rich chestnut-brown, paler towards the apex- spire 

 elongately conical, somewhat obtuse at the apex ; whorls 7 sh-htlv 

 convex, the last longer than the spire; sutures impressed, margmed 

 and crenulated ; aperture ovately oblong, bluish purple within ; outer 

 hp shghtly arcuate, and a httle thickened at the edge ; inner lip with 

 a strong callus, which is slightly flattened and expanded over the 

 columella. 



Alt. 3 inches 9 lines, diam. 1 mch 4 lines; length of aperture 

 I inch 6 lines, breadth 9 lines. 



Hah. Ekongo, S.E. coast of Madagascar. 



This fine Bulimus must not be confounded with B. clavator of 

 Petit de la baussaye, another Madagascar species. They are distinct 

 in form, texture, and other characters. 



f!^^S^^ ^^'^T\.''\ ^^' ^^^"^^^ Bartlett I have called this species 

 after Mr. R. J. Balston. ^ 



Helix watersi, n. sp. (Plate LIV. figs. 3 a, 3 b.) 

 Shell with a small compressed umbihcus, discoidal, rather solid • 

 obliquely closely striated with irregular, somewhat undulating erect 

 striae which are crossed by numerous concentric hnes, exhibiting here 

 and there a minutely reticulated appearance at the points of crossing 



